Form 4 Chemistry Exercise
Chapter 12 Ex1
Cut the following questions separately and paste them onto
your chemistry exercise books. Answer the questions
Repeat the “cut and paste action” for each question.
1. A student was asked to arrange five unknown metals A, B, C, D and E
in a reactivity series. He performed several experiments, with the results
tabulated as follows:
Experiment
A
moderate
reaction
1. Reaction
with cold
water
2. Reaction vigorous
with dilute reaction
hydrochloric acid
3. Heating the
oxide of the
metal
Metal
B
C
D
E
no reaction violent
no reaction no reaction
reaction
no reaction experiment reacts
no tried
steadily
not decomposed
no reaction
decomposed
into metal
and oxygen
(a) From the information given, arrange the five metals in descending order
of reactivity.
(b) Suggest why the reaction of C with dilute hydrochloric acid was not
attempted
(c) Which metal must be stored under paraffin oil? Why? What do you
expect of its usual appearance?
(d) Which metal can retain its shiny appearance after exposure to moist air
for a long time?
(e) Which metals have oxides, which can be reduced by heating with carbon
using a Bunsen flame?
(f) Is there any reaction if metal B is added to an aqueous solution of the
nitrate of E? Why? How about the case if metal E is added to an aqueous
solution of the nitrate of B?
(g) Suggest what the metals A, B, C, D and E might be.